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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85114c681a32ff7a75d8f8b3df8e429003dd6d4bebf5d25e9f3bc47d8cd9258' 
  AND token = 'uoJrdMOc39wMx2DozKBJSBDZZg+ncWGf5z0PgcR7+Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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