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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca11f52372827250d085ba42405d7a002fdf530bb6d385ecb56d1f4e07b4197' 
  AND token = 'z/jg/mXFxya4DDr3ezn5OQsFt9SlW82HLuNirzW79tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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