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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd2812827d6f522f1032ac55b6c087345c1a5adff3469ef1ccc30d45e1f174c' 
  AND token = 'rFYgPFonLrM4h4zUqZFvjo3DDyxbEyJA0/8m9MIPRbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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