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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73cbc8efadbc353f69cfbb5f03c27f635596a792cdf2c7b7212e190a535fe68' 
  AND token = '3JVb+q84b2+owHyx/PYd8gwf4G1YwebXS7uu1WFmLQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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