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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7af670a11ce6e6e560f6b0ecf18607f9316def31439365ee3987f46960a70d6' 
  AND token = '4H5/TPNnL06IzrbTeaChBfOIREJxpHAsMV6StP2WANM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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