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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b234cf179ac401103020039d2898999db770b5358da4d82a8a67146e030a5ef' 
  AND token = 'gOz0tkblAKA+nE3GGQEzZr99A+S+hNTi4VINErSsYWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}