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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2f6af945b496859fd185835bb76cd930a17de12fbd9ad7c7ac39ee614cc2d5' 
  AND token = 'G6LxW2yrfUFU6HYNPU2LbF11vKIARCdma5QX+arc3ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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