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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1aba490074465e403cf94da8251f0b2e4f5ec730d995cbe1d444762e70e716' 
  AND token = 'K1oCV3fxy+xPTchMZICKbK6XU2jOomnMps0Hzgb5LAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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