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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37ea348d2e13d214baaca53d035285c4b0e847d51665fab03605f596f34343d' 
  AND token = 'Jj2v0ZB5pSQE8XGX5jSnti8o2BBEtg3Ds/QuFXzIpOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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