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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db92ae55bf057e35011ec8392a8cd6ffc88efcfa2e07e87ad8dd6b718a120c1' 
  AND token = '9STqORu2pilzcLsPVZjh6mTV1vLPcWoyjofek1CmlAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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