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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7104826d23b0d39e29f2c8384a5321b3d0bb0c3cce9855e06fcf99a4544b1615' 
  AND token = 'Djqseu1yrgPU6F05W9LYooB5P2lBgBd7qjkMydfYa3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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