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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905bc8b8b6a00953ae66861527190e8204e8e4c867528fbdee2bba460c4b8d89' 
  AND token = 'OR7IyicPHV+2LQ8ysWZjTPOrHKCLCDibm9hAajkK23I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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