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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f970d8f766d9a6f20d83891a23f8f4b234546bdf3517286dd9169f5a6ea82f' 
  AND token = '//lQDIMxseF++nlFOFCe1I+KhFEHt/MXueN9oSHaV5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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