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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bed3d696af9f606f4942e82ec8b424213ffc27cac8af8d2c94975e5d412ee3' 
  AND token = '/10TRC51+HVe8f2IysIV/36iOYEqfsYNiI3NTPjxDnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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