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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5329ae8f049feb6c842f21059a05117e12e8ff4c2976d5d7d9ef593ac5ba7db6' 
  AND token = 'AfKneN8KxieD7j8+qxxq84050fNx70iJE1Bi8f5YwHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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