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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5d0c5f1895b63c4a2f2cf2daea311f8f7d10e354591df45d12255e735cd97e' 
  AND token = 'b6lXrRoYLukH19bmuC8eV4Fo90KxGdewRumfeam32DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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