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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80336074573cd7ae913c5dc8d5e57a039b98661f0f907dea65fb42171a50e2d' 
  AND token = 'iAt9evGzh1ky9FViX6yYkO0fpw74QmE7lHg13l8+bHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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