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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603baeaaaec6967720583e6458a1f05d0669efb4034be2b0e45e5b59acfbc1b6' 
  AND token = 'mSBfsv4uoSxTLOPblyWBdidWb/FhsvJnwrFB9GFRpXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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