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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d17b8219bbcb922f0323ea1d585082a92190987deaa5eed3de4b297caff92e' 
  AND token = '35AMmxseHSkqV9a1IvZDNWlJ+eNkZUo2Gg103NS+9cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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