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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ccd5c70f9f1ccbc47f3c2d85d561939c7039b0d3a035d15fbd989cd1ef649e' 
  AND token = 'DQ/txM1dk+upfOko4CQbLRrcnJE+n4BaCRt2gcONeio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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