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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6260c2f2e01b21230c6cc38b098a929b27b16144403f05fc1c432cad666fbbff' 
  AND token = '2JdEcbhhPkjXfJ7MObMigRGCNzWjZIVw/FRnmiHwn94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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