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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8ee4cefb148d9307d1eee6fa7c6eb6d3bc6a3719785860339425bdb4aaa886' 
  AND token = 'TdOpCoThvza4hueUuMduNygdNPtFXuxWlKiRRRotwRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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