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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3715958ba8c114f391ee453a2e5406636879f9c5fb1595a073ddc4113a5eaaba' 
  AND token = 'MDwFgZtc9JSSvQ6X/7W1Cr7AC54Uoxc1gA0YmzQvyZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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