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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc36ae50e3a6120f8cea7b7299307e2fa5203ab54f2162fc88135a2e18b6b33' 
  AND token = 'kRKPlkSlxeh86J1DwZr5IOuJ2Rti/FbkfcjyLilbXjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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