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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d08fda0da3b6eda5e8460657ffc2ba19300ee4eeff4a41a0149b4e4c4a031bd' 
  AND token = 'go7gDJId8fRns5kSqq4if2ymYCUz0ElKLrJPcxFwzEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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