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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3f16a774589eb4c71a2500c834e968446fa8ac2fde2f113550b91ab6b7eb17' 
  AND token = 'de7uITYrVgcuUjQfePlRJpBW0S1OgsLSz3jA2yvrta8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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