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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4fad8cf7e0e66116684d3c2153c882aff4d68ee26a421d64580be652191c5c' 
  AND token = 'kK5Wxu4J/OpxGfCmx7M++Argnwi9xvOQorqCNw26dFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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