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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c04d3b25a4a56343cce6849cd1d217380ad9f52eddf6486bb47e916e78add8' 
  AND token = 'u+Wne48cPmgF20Dy2qtqoSBB3CBk+zfjHEar1T6kL3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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