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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecc8efdfc9d7cd44e5d8cf2d32670402c5c7a5f345963d8e4de2b18d89910e8' 
  AND token = 'yxCkTWq/+CRTAZLbAWmTSh3Szc0j6EDBnqfX1r7Vecs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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