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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fb8d9a2dd07458e2a39f49f06e1f2c67d11353a7c4536908c873c6a5108cd0' 
  AND token = 'fg+QnQF8s5fHtL3FQyyOUz3d7pOExH1pdsG9WluPeUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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