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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f98c84fbc79af970f49a6cdfb4f021e8abf46b846d4266c2c858a0d6f5abd7' 
  AND token = 'MTwbAbDLmjMk+MQ3azb+oQwz8q8uAXaDaNqEKCiLbBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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