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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bb7e66f3b5c2016e766f87de1af5f6014483c8d6e31b4ed5276d22cc59e4c0' 
  AND token = 'QvQ/KDa49ecqc4+KLRGfvfMN3+xWh23W0U43Tf5neqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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