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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf4d5aba8a789bbb920f95de0dfd1916f3d1336313e3a4287392f0c1c03739e' 
  AND token = 'i6Cg59SzM8p0/AvVxErbG2Xo1l6EVcqIuiXCHnlgRN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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