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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e390e423e6e92d4c4da6d442e6057a5924ea06673e6f88c8e24792327baf49f3' 
  AND token = '0kLjpe3Urm6tfzlO5M1n5lAWklc+cWJXABB7HImWFYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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