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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb8923717637f5e1baccd12259daaa2c354c7c0afa5fe43f07b10a9bc0e329b' 
  AND token = 'Ym4RjcjMZrVoaGXP7y6ycb+MDIHcZ29F3aIMIPmmlXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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