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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d10670ececc6b9e9938d0fe6263fa62bfcf3760d3fc1f0c47d8c3364dc89d4a' 
  AND token = 'Xrk1i0izW9TIlpdZrOr3UnBInRynrS2XKqSNe3v3K2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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