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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3032a8054958019afb806289dc5fc959694f0345cd0a250c8b5d6b37e982488' 
  AND token = '+LuwPpFnS4M+WjC6r2h7X3nO/WvPF8tk+i8jiVCm1Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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