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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16474ca8514c8a52750ab16c22e8e47094f56b0520ec095d601ec04d3913f46' 
  AND token = 'YEQic8dgd8p4wkkuEn0rDrr35qz+3+z9/dBCmD3/ItI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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