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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930370c3f2a5463a2aa8ff4e8dd27808f4a22c7982266ce8ed9a62f81a3b45f1' 
  AND token = 'goU7j9vFvYCO0aEbgMxhoYPTtMeimwcI4/Ghu3oeas4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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