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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff9f0d58be6606dc8cdf4406b65277a16b27b0ad1be95a31a09d00982faab92' 
  AND token = 'Xvb99ac59TGVsp8/eIlS71xuJQmeE58RBXWzeADsr6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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