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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7480557d6a4b9ea8bcafa2bb5265450c0bfbc8d6df0be422f305dddf7a4a626b' 
  AND token = '0DBU4BHl5Wi6y25JYZx4/IGu4ZeBVGLMmUBrYfApWkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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