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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2343467054f9ab3f79f3ec06ef804f10cbf392fcff1401890178fe9a038190' 
  AND token = '9BxYtiEFQ6uKurW8OMiNs7pLbsMrcS01/cKHbo0s0i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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