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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4b5ab603389d7a9af2c5ce56af0288538dc51ae96f3440d5ad563559d1db74' 
  AND token = 'PalpyB1iXEBEjBSZo8myaOr+E2cw5QSudVMWOrwUEdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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