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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820ca940e5f5db389db09d5dce52ad69da174c5e2b5e0fd66a3d9f56ec8f1caa' 
  AND token = 'cTUELZtDbrCjxppJ4NdF/hn/Y+WHSTTDldAr6viMygI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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