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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5314623d01b2cf82a9ba19519a85ba7dcc9a217883903739b0a079f520aa27' 
  AND token = 'bCIu11xB3Mll3HK5u+8LAaGrVyp7qJOHob3dKV7j/Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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