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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcff813feec5569a55184bfc808b790e202d9b2d5055d691a5f33045e7c0580' 
  AND token = 'eS7wyhel26d/s9Job7clR2ijxPSklJ0y+uGhW9C5pO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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