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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe77f3e29e3b9c1dde4663bfe875c8a32964f412a1a5f526c29fde0f78ae72e5' 
  AND token = 'Xf/jlssvZALWbcT806oua3lTFpIi9lYKIqJkxWa2ODc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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