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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0dd3e51cd6228c911bcb1a148c854a9aa2529fd6fef0e02704047ca93076bc' 
  AND token = 'TrK+jHg7yhpbKBW1L9LqjzFue9723W02lndaDM8gKcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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