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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb998866ab23696b90a7044fdd52f559c3fa1f52367e61aec00a7d89af4929b9' 
  AND token = '47xyc2H87tgceSRp8m1oiV+OWKANReROy1Vv5W6i5YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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