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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7781efd4beb1a54c750b67f3b1876daf79922f7a47f222f1e610da55282f48dd' 
  AND token = '+yWp+nTRpPRQ1ZyU2gaBH6M9/Qk9XNDLfv2m8mOQmjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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