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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe7235afb0d3f4b498a2c2f07b9e2534b31ca0d282a055339858594be7e4e0a' 
  AND token = 'Q3aP8aw896g8eCGDiE7cCJ7dPmdeYI6ZyKrHqfqtfEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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